Are these Brake calipers normal?
Discussion
Gen 2 987 Cayman 2.9
I took all the calipers off today.
I noticed only on both front calipers there is a thin metal plate screwed into the piston on each pair of pistons.
I've never seen Porsche Brakes before, is this normal? If not, any idea why somebody would have done this and should i keep them like that? They worked perfectly fine before taking them off.
(i'm trying to upload pictures but it says to try again later)
I took all the calipers off today.
I noticed only on both front calipers there is a thin metal plate screwed into the piston on each pair of pistons.
I've never seen Porsche Brakes before, is this normal? If not, any idea why somebody would have done this and should i keep them like that? They worked perfectly fine before taking them off.
(i'm trying to upload pictures but it says to try again later)
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Press the New Post tab. Hit the browse tab. Find the image you wish to upload and press the open tab.
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We can then establish if what you have is the original factory anti-squeal shims or some aftermarket stainless or titanium shims to reduce heat transfer from the pad backplates to the caliper pistons and thereon to the brake fluid.
Press the New Post tab. Hit the browse tab. Find the image you wish to upload and press the open tab.
The image will take a couple of seconds to upload. When it's completed, hover your cursor over the image and in the top right hand corner it will bring up a small downward facing arrow. Hover the the cursor over this and it will bring up a Get share links tab. Click on this and then copy the BBCode (forums) link and paste it into your post on here.
We can then establish if what you have is the original factory anti-squeal shims or some aftermarket stainless or titanium shims to reduce heat transfer from the pad backplates to the caliper pistons and thereon to the brake fluid.
Those are the original anti-squeal shims.
If you’re using the car for a lot of track work, leave them out altogether or buy a set of stainless steel or titanium shims. There are several suppliers for them (Design 911 in the UK stock them)
If the car is used primarily for road use, remove the old shims and fit a new replacement set.
It’s ages since I fitted a set, but IIRC the lugs on the back of the shims either just slide into the open end of the caliper pistons (ensure the pistons are fully retracted back into the caliper if you’re fitting new pads, otherwise you won’t get the shims in) or they clip in, having slid/clipped the shims into the end of the pistons, you then tear of the adhesive backing material on the front of the shims to expose the adhesive that sticks the front of the shim to the back of the brake pad.
Edit to add, the screw heads you can see on the front of the anti-squeal shims, secure the lugs to the shims, they don’t fasten the shims to the pistons
If you’re using the car for a lot of track work, leave them out altogether or buy a set of stainless steel or titanium shims. There are several suppliers for them (Design 911 in the UK stock them)
If the car is used primarily for road use, remove the old shims and fit a new replacement set.
It’s ages since I fitted a set, but IIRC the lugs on the back of the shims either just slide into the open end of the caliper pistons (ensure the pistons are fully retracted back into the caliper if you’re fitting new pads, otherwise you won’t get the shims in) or they clip in, having slid/clipped the shims into the end of the pistons, you then tear of the adhesive backing material on the front of the shims to expose the adhesive that sticks the front of the shim to the back of the brake pad.
Edit to add, the screw heads you can see on the front of the anti-squeal shims, secure the lugs to the shims, they don’t fasten the shims to the pistons
Edited by Slippydiff on Tuesday 21st May 07:30
Slippydiff said:
Those are the original anti-squeal shims.
If you’re using the car for a lot of track work, leave them out altogether or buy a set of stainless steel or titanium shims. There are several suppliers for them (Design 911 in the UK stock them)
If the car is used primarily for road use, remove the old shims and fit a new replacement set.
It’s ages since I fitted a set, but IIRC the lugs on the back of the shims either just slide into the open end of the caliper pistons (ensure the pistons are fully retracted back into the caliper if you’re fitting new pads, otherwise you won’t get the shims in) or they clip in, having slid/clipped the shims into the end of the pistons, you then tear of the adhesive backing material on the front of the shims to expose the adhesive that sticks the front of the shim to the back of the brake pad.
Edit to add, the screw heads you can see on the front of the anti-squeal shims, secure the lugs to the shims, they don’t fasten the shims to the pistons
Thanks for this. It is for road use only.If you’re using the car for a lot of track work, leave them out altogether or buy a set of stainless steel or titanium shims. There are several suppliers for them (Design 911 in the UK stock them)
If the car is used primarily for road use, remove the old shims and fit a new replacement set.
It’s ages since I fitted a set, but IIRC the lugs on the back of the shims either just slide into the open end of the caliper pistons (ensure the pistons are fully retracted back into the caliper if you’re fitting new pads, otherwise you won’t get the shims in) or they clip in, having slid/clipped the shims into the end of the pistons, you then tear of the adhesive backing material on the front of the shims to expose the adhesive that sticks the front of the shim to the back of the brake pad.
Edit to add, the screw heads you can see on the front of the anti-squeal shims, secure the lugs to the shims, they don’t fasten the shims to the pistons
Edited by Slippydiff on Tuesday 21st May 07:30
I have bought some replacement ones to stick on for when i put the pads back in.
I'm used to putting copper grease on the back of pads before fitting them, is this needed on the fronts shims or the backs at all? The rear does not have these shims
Bobton125 said:
ok, should i grease the lugs that go into the pistons?
Also, should i grease the back of the pads for rear calipers? these have no shims
No need to grease the lugs on the back of the pads, they're not that tight a fit in the recess in the pistons (I suspect they act as a mass damper once they're stuck to the back of the pad too)Also, should i grease the back of the pads for rear calipers? these have no shims
Edited by Bobton125 on Wednesday 22 May 10:11
Rear pads/calipers should have these "stickies" which clip into the pistons and stick to the back of the pads :
https://www.design911.co.uk/fu/prod3824/Anti-Vibra...
When you see the price, you'll understand why they've been left out ...
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